<div class="icon"></div>
<form method="post" action="login">
    <!-- name/value -->
    <input class="username" name="username" placeholder="手机号/邮箱/会员名"></input>
    <input class="password" name="password" type="password" placeholder="请输入密码"></input>
    <div class="register"><span>免费注册</span><span>忘记密码</span></div>
    <input type="submit" value="提交" class="btn"></input>
</form>